Infectious dose of 50% (ID50) refers to the number of microorganisms required _________
Fill in the blank(s) with the appropriate word(s).
for 50% of exposed individuals to show signs of infection
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Which of the following is a difference between frogs and salamanders?
a. frogs have cloacas; salamanders do not b. salamander larvae are tetrapods; frog larvae are not c. salamanders have scales; frogs do not d. frogs reproduce in water; salamanders only sometimes reproduce in water e. more than one of these is a difference between frogs and salamanders
Which of the following is a good example of two genes that are orthologous?
A) the promoter and the repressor genes of the lac operon in E. coli B) the genes for the first two enzymes in the glycolytic pathway C) the gene for the photosynthetic enzyme RuBisCO in a fern and in an oak D) the human gene for the cell surface protein Siglec-12, and the human pseudogene Siglec-13 E) None of these pairs are orthologous.
How is an antiseptic different from a disinfectant?
An antiseptic kills or inactivates all microbial forms but a disinfectant does not destroy endospores. An antiseptic is used to remove or kill microorganisms on tissue, whereas a disinfectant is used to remove or kill microorganisms on inanimate objects. An antiseptic is used to remove or kill microorganisms IN the body, whereas a disinfectant is used to remove or kill microorganisms on the body surfaces. There is essentially no difference and these terms can be used interchangeably.
"Three-day measles" is caused by the (roseola/rubella/rubeola) virus
What will be an ideal response?